Emergency escape harness. We never had these in my era so I'm not quite sure what it's for. Thinking really hard, and putting my best airline captain brain to work, I figure it must be for escape from an airplane in distress. I mean that's what the name implies, so that has to be it; the FAA or Boeing would never lie to us. So if you're on fire at 33,000 feet, the challenge would be to determine which pilot gets to use it. The captain could pull rank, but the F/O would probably be younger and could beat the captain up and use the harness. After much thought, that's what I think would happen.